International, multicentre, prospective, randomized, double-blind, placebo-controlled study with a food supplement Imunoglukan P4H® chewable tablets to evaluate preventive effect on reduction of respiratory tract infections (RTIs) in children with a history of recurrent respiratory tract infections (RRTIs) in the previous infectious season prior enrolment. Participants or their guardians will record the incidence and duration of RTIs in the Patient diary for 3 months.
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change in the number of RTIs episodes (total number)
Timeframe: change in the number of RTIs episodes (total number) during 3 month supplementation (from enrollment to the end of the treatment at 3 months)